An isotopically coded CID-cleavable biotinylated cross-linker for structural proteomics.

Molecular & Cellular Proteomics : MCP
Evgeniy V PetrotchenkoChristoph H Borchers

Abstract

Successful application of cross-linking combined with mass spectrometry for structural proteomics demands specifically designed cross-linking reagents to address challenges in the detection and assignment of cross-links. A combination of affinity enrichment, isotopic coding, and cleavage of the cross-linker is beneficial for detection and identification of the peptide cross-links. Here we describe a novel cross-linker, cyanurbiotindipropionylsuccinimide (CBDPS), that allows affinity enrichment of cross-linker-containing peptides with avidin. Affinity enrichment eliminates interfering non-cross-linked peptides and allows the researcher to focus on the analysis of the cross-linked peptides. CBDPS is also isotopically coded and CID-cleavable. The cleaved fragments still contain a portion of the isotopic label and can therefore be distinguished from unlabeled fragments by their distinct isotopic signatures in the MS/MS spectra. This cleavage information has been incorporated into a program for the automatic analysis of the MS/MS spectra of the cross-links. This allows rapid determination of cross-link type in addition to facilitating identification of the individual peptides constituting the interpeptide cross-links. Thus, affinity...Continue Reading

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Citations

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